Precipitation variability using GPCC data and its relationship with atmospheric teleconnections in Northeast Brazil

Abstract The present study investigates the influence of different atmospheric teleconnections on annual precipitation variability in Northeast Brazil (NEB) based data from Global Precipitation Climatology Center (GPCC) 1901 to 2013. objective this is analyze total NEB for 1901–2013 period, considering physical characteristics four subregions, i.e., Mid-north, Backwoods, Agreste, and Forest zone. To teleconnections, GPCC were used, behavior was assessed using Pearson correlation coefficient, Rainfall Anomaly Index (RAI), cross-wavelet analysis. used studied region. RAI calculate frequency patterns drought episodes. analysis applied identify similarity signals between series teleconnections. results according Student's t test showed that Atlantic Multidecadal Oscillation (AMO) exerts a more significant Backwoods region at an interannual scale. In contrast, Pacific Decadal (PDO) greater control over modulation climatic NEB. are insightful reveal differential impacts such as AMO, PDO, MEI, NAO sub-regions circulation strongly interdecadal Mid-north regions, possibly associated with Intertropical Convergence Zone (ITCZ) position. Finally, contributes understanding internal planning water resources agricultural activities Graphic abstract